Willis H. O'Brien, who earlier used stop-motion animation of dinosaur models in Un mondo perduto (1925), had created several dinosaur models for his unfinished production, Creation (1931). Merian C. Cooper sold the idea for this film to R.K.O. executives in New York City by showing them a test sequence using O'Brien's models. The executives were stunned, never having seen anything like it, and green-lit production. O'Brien also used many of his "Creation" models in this film, including the T-Rex and the Pteranodon.

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